Square, triangle, circle, oval. Anything that can be drawn on a flat (planar) surface.
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The net of a 2 dimensional shape can be folded into a 3 dimensional shape
A 2-dimensional shape is a 'DECAGON'. A 3-dimensional shape is a 'DECAHEDRON'.
a polyhedron * * * * * That is only if it is bounded by plane faces. A sphere, for example, is a three dimensional shape but is not a polyhedron: it is a solid shape.
Nope - A polygon is a flat, 2-dimensional shape. A Polyhedron is a 3-dimensional shape.
it is some that •The shape is the 2-dimensional outline of an object; forms are 3-dimensional versions of the shape.